Nmi Signal Mask Function; Bus Interface Pin; Bus Interface Pin Operation List - NEC V850/SV1 User Manual

4.4 NMI Signal Mask Function

When using the P00/NMI pin in the port mode, do not mask the NMI signal.

4.5 Bus Interface Pin

The operation of the pin for the bus interface differs between the emulator and the target device as follows.
Pin Name
Memory Used by
Emulator
F
A16 to A21 Hold the last accessed address
AD0 to AD15 Hi-Z
ASTB H
R/W H
DSTB H
LBEN H
UBEN H
WAIT Invalid
HLDRQ Maskable
HLDAK H or L
WRL H
WRH H
RD H
Note Active
Remarks 1. F: Fetch
R: Read
W: Write
2. H: High-level output
L: Low-level output
Hi-Z: High-impedance
CHAPTER 4
Table 4-1. Bus Interface Pin Operation List (1/2)
(a) During break
Internal Memory
Internal Internal RAM
ROM
R W R R
User's Manual U14337EJ1V0UM00
CAUTIONS
Internal Emulation RAM
Peripheral I/O
W R W R
Active
Active
Active
Active
H
Active
Active
Maskable
Maskable
H or L
H
H
H
External Memory
Target System
W R W
Active
Active
Active
Active
Active
Active
Active
Maskable
Maskable
H or L
H Note
H Note
Note H
29